US9024330B2 - Semiconductor device and manufacturing method thereof - Google Patents
Semiconductor device and manufacturing method thereof Download PDFInfo
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- US9024330B2 US9024330B2 US14/141,174 US201314141174A US9024330B2 US 9024330 B2 US9024330 B2 US 9024330B2 US 201314141174 A US201314141174 A US 201314141174A US 9024330 B2 US9024330 B2 US 9024330B2
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- silicon carbide
- semiconductor device
- carbide layer
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 title abstract description 31
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 59
- 230000004888 barrier function Effects 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 19
- 239000000463 material Substances 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- 230000005669 field effect Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 238000005530 etching Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000005468 ion implantation Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/47—Schottky barrier electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/0445—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising crystalline silicon carbide
- H01L21/048—Making electrodes
- H01L21/0485—Ohmic electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System
- H01L21/28518—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic System the conductive layers comprising silicides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic System
- H01L29/1608—Silicon carbide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/45—Ohmic electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66053—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide
- H01L29/66068—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7803—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device
- H01L29/7806—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device the other device being a Schottky barrier diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
Definitions
- the present application relates to a semiconductor device of which semiconductor material is silicon carbide, and a manufacturing method thereof.
- Silicon carbide is known as a semiconductor material allowing implementation of a semiconductor device with a low loss and which can operate stably at high temperature.
- a structure has been proposed in which a field effect transistor includes a built-in Schottky barrier diode in order to reduce the number of components of the semiconductor device.
- An example of such a structure is disclosed in Japanese Patent Application Publication No. H8-204179.
- a trench penetrating a p-type base region needs to be formed. This increases the number of masks needed to manufacture the semiconductor device, thus increasing manufacturing costs.
- a semiconductor device has been desired which is formed using silicon carbide as a semiconductor material and includes a built-in Schottky barrier diode and which can be manufactured by simplified manufacturing steps.
- a method of manufacturing a semiconductor device disclosed herein includes forming an ohmic electrode in a first area on one of main surfaces of a silicon carbide layer, siliciding the ohmic electrode, and forming a Schottky electrode in a second area on the one of the main surfaces of the silicon carbide layer with self alignment. The second area is exposed where the ohmic electrode is not formed.
- the ohmic electrode is preformed to allow the Schottky electrode to be formed by self alignment.
- the manufacturing method allows the manufacture, by simplified manufacturing steps, of the semiconductor device formed using silicon carbide as a semiconductor material and including a built-in Schottky barrier diode.
- a semiconductor device disclosed herein includes a silicon carbide layer, an ohmic electrode being in an ohmic contact with a first area on one of main surfaces of the silicon carbide layer, and a Schottky electrode being in an ohmic contact with a second area on the one of the main surfaces of the silicon carbide layer and covering the ohmic electrode.
- the silicon carbide layer includes a drift region of a first conductivity type, a base region of a second conductivity type, and a source region of the first conductivity type.
- the drift region includes an exposure portion exposed in the second area on the one of the main surfaces of the silicon carbide layer.
- the base region is disposed above the drift region, exposed in the first area on the one of the main surfaces of the silicon carbide layer, and includes portions that are spaced apart by the exposure region in between.
- the source region is surrounded by the base region and exposed in the first area on the one of the main surfaces of the silicon carbide layer.
- the exposure portion of the drift region is exposed in the second area on the one of the main surfaces of the silicon carbide layer.
- the Schottky electrode is in Schottky contact with the exposure portion of the drift region.
- the base region and the source region are exposed in the first area on the one of the main surfaces of the silicon carbide layer.
- the ohmic electrode is in ohmic contact with the base region and the source region.
- the Schottky electrode covers the ohmic electrode. That is, the Schottky electrode has a structure that can be produced by self alignment using the ohmic electrode.
- the semiconductor device has a structure that can be manufactured by simplified manufacturing steps.
- FIG. 1 schematically shows a cross-sectional view of a main part of a semiconductor device
- FIG. 2 schematically shows a cross-sectional view of a characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 3 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 4 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 5 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 6 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 7 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 8 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device
- FIG. 9 schematically shows a cross-sectional view of the characteristic part of the semiconductor device during a step of manufacturing the semiconductor device.
- FIG. 10 schematically shows a cross-sectional view of a characteristic part of the semiconductor device during a step of manufacturing the semiconductor device.
- a manufacturing method disclosed herein is used to manufacture a semiconductor device formed using silicon carbide as a semiconductor material and including a built-in Schottky barrier diode.
- the semiconductor device may be, for example, a metal oxide semiconductor field effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT).
- the manufacturing method includes forming an ohmic electrode in a first area on one of main surfaces of a silicon carbide layer, siliciding the ohmic electrode, and forming a Schottky electrode in a second area on the one of the main surfaces of the silicon carbide layer with self alignment, wherein the second area is exposed where the ohmic electrode is not formed.
- a material for the ohmic electrode may be, for example, nickel, titanium, or aluminum.
- a material for the Schottky electrode may be, for example, molybdenum, nickel, gold, titanium, or aluminum.
- An embodiment of a semiconductor device disclosed herein includes a silicon carbide layer, an ohmic electrode being in an ohmic contact with a first area on one of main surfaces of the silicon carbide layer, and a Schottky electrode being in an ohmic contact with a second area on the one of the main surfaces of the silicon carbide layer and covering the ohmic electrode.
- the silicon carbide layer includes a drift region of a first conductivity type, a base region of a second conductivity type, and a source region of the first conductivity type.
- the drift region includes an exposure portion exposed in the second area on the one of the main surfaces of the silicon carbide layer.
- the base region is disposed above the drift region, exposed in the first area on the one of the main surfaces of the silicon carbide layer, and includes portions that are spaced apart by the exposure region in between.
- the source region is surrounded by the base region and exposed in the first area on the one of the main surfaces of the silicon carbide layer.
- the semiconductor device has a built-in Schottky barrier diode formed by the Schottky contact between the exposure portion of the drift region and the Schottky electrode.
- the semiconductor device may further include a gate portion facing the base region separating the drift region and the source region.
- the semiconductor device has a structure in which a field effect transistor includes a built-in Schottky barrier diode.
- the gate portion may include a trench gate electrode filled within a trench penetrating the base region from the one of the main surfaces of the silicon carbide layer.
- the semiconductor device has a field effect transistor with a trench type insulating gate portion.
- the semiconductor device may further include a barrier layer of an insulating material, the barrier layer covering the trench gate electrode.
- the Schottky electrode may cover the barrier layer.
- a semiconductor device 1 includes a drain electrode 12 , a silicon carbide layer 20 , an ohmic electrode 14 , a Schottky electrode 16 , a source electrode 18 , an insulating gate portion 32 , and a barrier layer 34 .
- the drain electrode 12 is formed to cover an entire back surface 20 a of the silicon carbide layer 20 and is in ohmic contact with the back surface 20 a of the silicon carbide layer 20 .
- a material for the drain electrode 12 may be, for example, nickel, titanium, gold, or a layered electrode thereof.
- the silicon carbide layer 20 has an n-type substrate 22 , an n-type drift region 24 , a p-type base region 26 , and an n-type source region 28 .
- the n-type substrate 22 is a silicon carbide substrate with a [0001] plane orientation.
- the drift region 24 is formed by crystal growth from the substrate 22 utilizing an epitaxial growth technique.
- the drift region 24 has a protruding exposure portion 24 a in an upper portion of the drift region 24 .
- An upper surface of the exposure portion 24 a is exposed in a second area 2 A on a surface 20 b of the silicon carbide layer 20 .
- the base region 26 is formed by introducing p-type impurities (by way of example, aluminum) through the surface 20 b of the silicon carbide layer 20 by performing an ion implantation operation a plurality of times with an ion range changed for each operation. Opposite portions of the base region 26 are arranged with the exposure portion 24 a of the drift region 24 located between the portions. In other words, the exposure portion 24 a of the drift region 24 is formed between the opposite portions of the base region 26 .
- the base region 26 has a contact portion 26 a in an upper portion thereof. The contact portion 26 a is exposed in a part of a first area 1 A on the surface 20 b of the silicon carbide layer 20 and contains a relatively high concentration of impurities.
- the source region 28 is formed by introducing n-type impurities (by way of example, phosphor) through the surface 20 b of the silicon carbide layer 20 utilizing the ion implantation technique.
- the source region 28 is surrounded by the base region 26 and spaced apart from the drift region 24 by the base region 26 .
- the source region 28 is exposed in a part of the first area 1 A on the surface 20 b of the silicon carbide layer 20 .
- the exposure portion 24 a of the drift region 24 , the contact portion 26 a of the base region 26 , and the source region 28 appear to have a striped layout.
- the ohmic electrode 14 is formed on a part of the surface 20 b of the silicon carbide layer 20 by patterning and is in ohmic contact with the contact portion 26 a of the base region 26 and the source region 28 both exposed in the first area 1 A on the surface 20 b of the silicon carbide layer 20 .
- a material for the ohmic electrode 14 maybe, for example, silicided nickel.
- the Schottky electrode 16 is formed to cover the entire surface side 20 b of the silicon carbide layer 20 and covers a part of the surface 20 b of the silicon carbide layer 20 , the ohmic electrode 14 , and a barrier layer 34 .
- the Schottky electrode 16 is in Schottky contact with the exposure portion 24 a of the drift region 24 exposed in the second area 2 A on the surface 20 b of the silicon carbide layer 20 .
- Molybdenum is used as a material for the Schottky electrode 16 .
- the source electrode 18 covers the entire surface of the Schottky electrode 16 .
- a material for the source electrode 18 may be, for example, titanium, aluminum, or a layered electrode thereof.
- the insulating gate portion 32 faces the base region 26 separating the drift region 24 and the source region 28 , and forms a channel in the base region 26 between the drift region 24 and the source region 28 .
- the insulating gate portion 32 includes a gate insulating film 32 a and a trench gate electrode 32 b both provided in a trench penetrating the base region 26 from the surface of the silicon carbide layer 20 .
- the gate insulating film 32 a is formed by being coated on an inner wall of the trench utilizing a thermal oxidation technique or a CVD technique.
- the trench gate electrode 32 b is formed by being filled into the trench coated with the gate insulating film 32 a utilizing the CVD technique.
- the barrier layer 34 covers and insulates the trench gate electrode 32 b from the ohmic electrode 14 , the Schottky electrode 16 , and the source electrode 18 .
- the semiconductor device 1 is, for example, used for an inverter device that supplies an alternating current to an AC motor.
- the semiconductor device 1 has a structure in which a metal oxide semiconductor field effect transistor (MOSFET) with the trench type insulating gate portion 32 includes a built-in Schottky barrier diode.
- MOSFET metal oxide semiconductor field effect transistor
- the Schottky barrier diode is built into the MOSFET by bringing the Schottky electrode 16 into Schottky contact with the exposure portion 24 a of the drift region 24 .
- the Schottky barrier diode operates as a freewheel diode. That is, the Schottky barrier diode serves to pass a current to the AC motor while the MOSFET is off.
- the drift region 24 , the base region 26 , and the source region 28 are formed on the substrate 22 utilizing the epitaxial growth technique and the ion implantation technique.
- the gate insulating film 32 a and trench gate electrode 32 b of the insulating gate portion 32 are formed utilizing an etching technique or the CVD technique.
- a known manufacturing method may be applied.
- the barrier layer 34 is patterned on the insulating gate portion 32 utilizing the CVD technique and the etching technique.
- a material for the barrier layer 34 may be a material with hydrofluoric acid resistance.
- the barrier layer 34 is a silicon nitride film.
- a mask layer 42 is patterned on the barrier layer 34 and the exposure portion 24 a of the drift region 24 utilizing the CVD technique and the etching technique.
- a material for the mask layer 42 has the property of being dissolved in hydrofluoric acid.
- the mask layer 42 is a silicon oxide film.
- the ohmic electrode 14 is formed utilizing a PVD technique (sputtering method or vapor deposition method). Subsequently, an anneal process is carried out on the silicon carbide layer 20 at about 1,000° C. for about 10 minutes. This allows an interface portion of the ohmic electrode 14 which is in contact with the silicon carbide layer 20 to be silicided to have ohmic characteristics.
- PVD technique sputtering method or vapor deposition method
- a portion of the ohmic electrode 14 which is not silicided is selectively removed utilizing a solution having the property of dissolving metal.
- the ohmic electrode 14 is patterned in association with the first area 1 A on the surface 20 b of the silicon carbide layer 20 .
- the mask layer 42 is selectively removed utilizing hydrofluoric acid.
- the Schottky electrode 16 is formed utilizing the PVD technique (sputtering method or vapor deposition technique).
- the Schottky electrode 16 is formed all over the surface side 20 b of the silicon carbide layer 20 .
- the Schottky electrode 16 is formed by self alignment in contact with the exposure portion 24 a of the drift region 24 present between opposite portions of the ohmic electrode 14 .
- the source electrode 18 is formed utilizing the CVD technique on the Schottky electrode 16 to complete the semiconductor device 1 shown in FIG. 1 .
- the ohmic electrode 14 covering the contact portion 26 a of the base region 26 and the source region 28 is preformed, and a window portion is formed between opposite portions of the ohmic electrode 14 .
- the semiconductor device 1 adopts a structure in which the exposure portion 24 a of the drift region 24 is exposed in the surface 20 b of the silicon carbide layer 20 in association with the window portion.
- the Schottky electrode 16 can be produced by self alignment.
- the semiconductor device 1 can be manufactured by simplified manufacturing steps.
Abstract
Description
Claims (4)
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JP2013-027352 | 2013-02-15 | ||
JP2013027352A JP2014157896A (en) | 2013-02-15 | 2013-02-15 | Semiconductor device and manufacturing method of the same |
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JP7310144B2 (en) * | 2019-01-10 | 2023-07-19 | 富士電機株式会社 | Silicon carbide semiconductor device |
CN110350035A (en) * | 2019-05-30 | 2019-10-18 | 上海功成半导体科技有限公司 | SiC MOSFET power device and preparation method thereof |
US20230036221A1 (en) * | 2020-02-13 | 2023-02-02 | Mitsubishi Electric Corporation | Method for fabricating silicon carbide semiconductor device and power conversion device using the silicon carbide semiconductor device |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08204179A (en) | 1995-01-26 | 1996-08-09 | Fuji Electric Co Ltd | Silicon carbide trench mosfet |
US20030022474A1 (en) * | 2001-07-24 | 2003-01-30 | Koninklijke Philips Electronics N.V. | Manufacture of semiconductor devices with schottky barriers |
US20040212011A1 (en) | 2003-04-24 | 2004-10-28 | Sei-Hyung Ryu | Silicon carbide mosfets with integrated antiparallel junction barrier schottky free wheeling diodes and methods of fabricating the same |
JP2005108926A (en) | 2003-09-29 | 2005-04-21 | Nissan Motor Co Ltd | Semiconductor device |
US20090272982A1 (en) | 2008-03-03 | 2009-11-05 | Fuji Electric Device Technology Co., Ltd. | Trench gate type semiconductor device and method of producing the same |
JP2010225615A (en) | 2009-03-19 | 2010-10-07 | Denso Corp | Silicon carbide semiconductor device and manufacturing method for the same |
WO2011136272A1 (en) | 2010-04-28 | 2011-11-03 | 日産自動車株式会社 | Semiconductor device |
JP2012049562A (en) | 2011-11-04 | 2012-03-08 | Renesas Electronics Corp | Semiconductor device |
-
2013
- 2013-02-15 JP JP2013027352A patent/JP2014157896A/en active Pending
- 2013-12-26 US US14/141,174 patent/US9024330B2/en not_active Expired - Fee Related
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08204179A (en) | 1995-01-26 | 1996-08-09 | Fuji Electric Co Ltd | Silicon carbide trench mosfet |
US5614749A (en) | 1995-01-26 | 1997-03-25 | Fuji Electric Co., Ltd. | Silicon carbide trench MOSFET |
US20030022474A1 (en) * | 2001-07-24 | 2003-01-30 | Koninklijke Philips Electronics N.V. | Manufacture of semiconductor devices with schottky barriers |
JP2004522319A (en) | 2001-07-24 | 2004-07-22 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Manufacturing of semiconductor devices with Schottky barrier |
JP2006524432A (en) | 2003-04-24 | 2006-10-26 | クリー インコーポレイテッド | Silicon carbide MOSFET with integrated anti-parallel junction barrier Schottky-free wheeling diode and method for manufacturing the same |
US20040212011A1 (en) | 2003-04-24 | 2004-10-28 | Sei-Hyung Ryu | Silicon carbide mosfets with integrated antiparallel junction barrier schottky free wheeling diodes and methods of fabricating the same |
JP2005108926A (en) | 2003-09-29 | 2005-04-21 | Nissan Motor Co Ltd | Semiconductor device |
US20090272982A1 (en) | 2008-03-03 | 2009-11-05 | Fuji Electric Device Technology Co., Ltd. | Trench gate type semiconductor device and method of producing the same |
JP2009302510A (en) | 2008-03-03 | 2009-12-24 | Fuji Electric Device Technology Co Ltd | Trench gate type semiconductor device, and method of manufacturing the same |
JP2010225615A (en) | 2009-03-19 | 2010-10-07 | Denso Corp | Silicon carbide semiconductor device and manufacturing method for the same |
WO2011136272A1 (en) | 2010-04-28 | 2011-11-03 | 日産自動車株式会社 | Semiconductor device |
US20130043524A1 (en) | 2010-04-28 | 2013-02-21 | Nissan Motor Co Ltd | Semiconductor device |
JP2012049562A (en) | 2011-11-04 | 2012-03-08 | Renesas Electronics Corp | Semiconductor device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109860171A (en) * | 2019-01-31 | 2019-06-07 | 电子科技大学 | The ambipolar SiC semiconductor power device of the reversed freewheeling diode of integrated high-speed |
CN109904155A (en) * | 2019-01-31 | 2019-06-18 | 电子科技大学 | A kind of silicon carbide MOSFET device of the reversed freewheeling diode of integrated high-speed |
CN109904155B (en) * | 2019-01-31 | 2021-02-02 | 电子科技大学 | Silicon carbide MOSFET device integrated with high-speed reverse freewheeling diode |
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JP2014157896A (en) | 2014-08-28 |
US20140231827A1 (en) | 2014-08-21 |
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